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• Image Uploading - security issues

  - by TenaciousImpy

  Hi, I'm developing an ASP.NET Web app and would like the user to be able to either upload an image from their local system, or pass in a URL to an image. The image can either be a JPG or PNG. What security issues should I be concerned about doing this? I've seen various ways of embedding code within JPG files. Are there any methods in C# (or external libraries) which can confirm that a file is a JPG/PNG, otherwise throw an error? At the very least, I'm making the directory which holds uploaded images non-browsable and putting a max size limit of 1mb, but I'd like to implement further checks. Thanks for any advice.

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• .Net friendly, local, key-value pair, replicatable datastore

  - by Brad Mathews

  I am looking for a key/value type datastore with very specific requirements. Anyone know anything that will work? Needs to be a component of some sort. No additional installation needed. The datastore needs to be on the local hard drive. I am using VB.Net for a desktop app running Windows XP through 7 so it needs to callable by that environment. It needs to replicatable. If I have four copies of my app running on the network, each local copy of the datastore needs to replicate with the others. As close to real time as possible. The first three are easy, I can do that with ADO.Net out of the box. The last one, replication, is the one I do not have answer to. Does such an animal exist? Thanks, Brad

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• Recommendation for web-based database visualization tool

  - by prometheus

  Tableau is extremely flexible when it comes to visualizing and playing around with datasets, but it is extremely slow when you go into "production mode" and publish a particular view that you've created onto your server. Does anyone know of any tools that can be used to connect to a database, present interactive (or somewhat interactive) dashboards, and perform reasonably well when published to a server? To be clearer, I am looking for something like this -- http://www.corda.com/executive-dashboard-graph-styles.php. I realize that such a product might not exist. If so, is there a particular framework or library that I could use to create killer interactive visualizations of data for the web?

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• optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?

  - by brahn

  I've been a bad kid and used the following syntax in my partial templates to set default values for local variables if a value wasn't explicitly defined in the :locals hash when rendering the partial -- <% foo = default_value unless (defined? foo) %> This seemed to work fine until recently, when (for no reason I could discern) non-passed variables started behaving as if they had been defined to nil (rather than undefined). As has been pointed by various helpful people on SO, http://api.rubyonrails.org/classes/ActionView/Base.html says not to use defined? foo and instead to use local_assigns.has_key? :foo I'm trying to amend my ways, but that means changing a lot of templates. Can/should I just charge ahead and make this change in all the templates? Is there any trickiness I need to watch for? How diligently do I need to test each one?

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• AnkhSVN: No Versioned Parent Directories when adding a Web Site

  - by CJM

  I've recently been trying out Ankhsvn and I quite like it, and more importantly, it generally likes me. But I've hit a problem adding existing VS projects to subversion using AnkhSVN. Most Windows and Web projects are added fine, but I have a problem when I try to a Websites (as opposed to Web Applications), and in these cases I get the following error: No versioned parent directories After some googling, I've come across other people with the same problems and there have been one or two suggests for solving the problem, but non so far have worked. AnkhSVN is popular enough, and although web applications are often preferred to websites these days, I'm hoping that someone here has a ready solution available.

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• Accessing the feed/entry/id field of an ATOM 1.0 feed with the ROME library

  - by PartlyCloudy

  Hi, I feel a bit stupid asking this question, but I don't know how I can access the ID field of an entry when using ROME to parse an Atom feed. ROME provides it's own meta level of feeds/items, i.e. SyndFeed and SyndEntry. Being an abstraction over RSS and ATOM they only contain elements both formats support. Thus, there is no method to get an ID of an entry. There also exist low level packages for the distinct formats, and the Atom package contains com.sun.syndication.feed.atom.Entry, which provides getId(). However, I don't know how can I convert my SyndEntry into an Entry. I have not found a way to convert it. The (outdated) tutorials show a conversion, but that's only for output though. So how can I easily access the ID field? Thanks in advance.

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• What's the best way to authorize a USB Key

  - by ScottCate

  We have an auto update for our software that is installed via USB key (with the auto run). If I wanted to ensure that only authorized USB Keys were used, what's the best way? Our installer is already signed, and it won't run otherwise. But I'm more wanting to inspect the USB Key for a signed installer, and if it's not there, just ignore, or even "Eject" the USB device. And I should be able to tell the difference (in code) between a usb storage device, and say a camera, or keyboard. I'm only wanting to disable non-authorized storage devices. Thank you for your ideas.

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• Any tool available to detect what's not HTTPS on an encrypted page?

  - by Keltex

  More often than I like when designers edit some of our sites' pages, they include javascript or an external image our SSL pages that are not encrypted. For example if we have a page like this: https://www.example.com/cart/EnterCreditCard And the designer includes some non-encrypted image like this: <img src='http://www.cardprocessor.com/logo.gif' /> Of course, this creates errors in all browsers: IE: Do you want to view only the webpage content that was delivered securely? Firefox: Connection Partially Encrypted Chrome: (I forget this message) What I'm looking for is a tool or plugin that lets me easily see what objects are not encrypted. A firefox extension or something along those lines would be great.

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• .NET /asp.net 4: Changes with automatic NAMES of controls?

  - by mark smith

  Hi there, I just updated an app from .net 2.0 to .net 4.0 and i have noticed the following... For example i have the following control.. <input type="hidden" name="ctl00$cphMain$hfdFueraHorarioOficinaConfirmado" id="cphMain_hfdFueraHorarioOficinaConfirmado" value="False" /> and then in javascript i did this before.. var hfdFueraHorarioOficinaConfirmado=document.getElementById('ctl00_cphMain_hfdFueraHorarioOficinaConfirmado'); but after checking the Id within the html source once it renders and also doing some debugging with firebug etc.... it has changed from ctl00_cphMain_hfdFueraHorarioOficinaConfirmado to cphMain_hfdFueraHorarioOficinaConfirmado can anyone explain why? .... so should i basically do a search and replace and remove the ctl00?????? A little confused Obviosuly the javascript line with the the ctl00_ infront return NULL because it doesn't exist, but removing this returns the object.. Any help or ideas really appreciated Thanks

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• Trouble making OAuth signed requests

  - by behrk2

  Hello, I am able to successfully make non-authenticated and protected calls to the Netflix API. I am having a little trouble making signed requests to the catalog, however. Using the OAuth Test page, it is clear to me that my Base String is correct. My request URL is also correct, except for the oauth_signature. The oauth_signature is the only thing that differs. If I understand correctly, the only difference between a protected call and a signed call is that there are no tokens involved, and that I am appending on call parameters (such as term). So, I am using the exact same code that I use for my protected calls that I am for my signed calls, except my signature key ONLY contains my shared secret (with an ampersand sign on the end of it). It does not use the access token. Am I missing something here? Where else can I be going wrong? Thanks!

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• Creating an iphone book application

  - by ennuikiller

  I have some experience creating iphone applications and would now like to create an iphone book application. Browsing the Book category in iTunes it seems to there is a standard format for building these apps, however, googling for how to build an iphone book app produces no useful results. This type of application is also not addressed in any of the iphone development books I've seen. Is there a standard method fot building these book applications? Or is it simply copying the text is some format (pdf, txt, html?) and then writing a document handling api? It seems there already must exist apis for doing this. Can anyone point me in the right direction. Thanks in advance!

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• Setting Curl's Timeout in PHP

  - by Moki

  I'm running a curl request on an eXist database through php. The dataset is very large, and as a result, the database consistently takes a long amount of time to return an XML response. To fix that, we set up a curl request, with what is supposed to be a long timeout. $ch = curl_init(); $headers["Content-Length"] = strlen($postString); $headers["User-Agent"] = "Curl/1.0"; curl_setopt($ch, CURLOPT_URL, $requestUrl); curl_setopt($ch, CURLOPT_HEADER, false); curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERPWD, 'admin:'); curl_setopt($ch,CURLOPT_TIMEOUT,1000); $response = curl_exec($ch); curl_close($ch); However, the curl request consistently ends before the request is completed (<1000 when requested via a browser). Does anyone know if this is the proper way to set timeouts in curl?

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• HMM for perspective estimation in document image, can't understand the algorithm

  - by maximus

  Hello! Here is a paper, it is about estimating the perspective of binary image containing text and some noise or non text objects. PDF document The algorithm uses the Hidden Markov Model: actually two conditions T - text B - backgrouond (i.e. noise) It is hard to understand the algorithm itself. The question is that I've read about Hidden Markov Models and I know that it uses probabilities that must be known. But in this algorithm I can't understand, if they use HMM, how do they get those probabilities (probability of changing the state from S1 to another state for example S2)? I didn't find anything about training there also in that paper. So, if somebody understands it, please tell me. Also is it possible to use HMM without knowing the state change probabilities?

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• How to get ID of EditorFor with nested viewmodels in asp.net mvc 2

  - by Luke

  So I have two nested view models, CreditCard - BillAddress. I have a view, "EditBilling", that has EditorFor(CreditCard). The CreditCard EditorTemplate has EditorFor(BillAddress), and the BillAddress EditorTemplate has EditorFor(BillState). The end result is a select list with id "CreditCard_BillAddress_BillState". I need to reference this in javascript, thus need to know the ID. In other situations, with non-nested ViewModels, I have used the following code: $('#<%= ViewData.ModelMetadata.PropertyName %>_BillState') The problem here is that the ModelMetadata.PropertyName property is only aware of the current property, not the parent(s). So I end up with the following: $('#BillAddress_BillState') How does one go about getting the client ID of nested strongly typed helpers? Thanks in advance.

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• Django : proper way to use model, duplicates!

  - by llazzaro

  Hello, I have a question about the proper, best way to manage the model. I am relative newbie to django, so I think I need to read more docs, tutorials,etc (suggestions for this would be cool!). Anyway, this is my question : I have a python web crawler, that is "connected" with django model. Crawling is done once a day, so its really common to find "duplicates". To avoid duplicates I do this : cars = Car.Objects.filter(name=crawledItem['name']) if len(cars) 0: #object already exists, update it car = cars[0] else: car = Car() #some non-relevant code here car.save() I want to know, if this is the proper/correct way to do it or its any "automatic" way to do it. Its possible to put the logic inside the Car() constructor also, should I do that? Thanks a lot!

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• What technical/legal responsibilities do I have when hosting images uploaded by others?

  - by Ferdy

  You may argue that this question has a legal flavor to it, and that would be correct. Still, it is also a question from a developer's perspective that may help others. I'm building an image community web site/application. Users can upload images. During upload, users have to select the license (copyrighted, attribution non-commercial or public domain). No matter which license they choose, it is just a piece of data. No matter the license, all users can view all images and also download all images, as you normally do on websites. My question is: what responsibility do I have as a "platform" to comply with these licenses? Do I need to actively prevent certain actions on these images, and into what extend? Is displaying the license enough to be legally safe? What if one of my users uploads images for which he has no license? Is it enough to just implement a "report this" feature?

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• Simple image server

  - by Joel

  I have a bunch of images that I need others to browse via a web browser in pretty much the same way as Apache-Gallery. I'd be able to dump all my images in a directory so that users hitting: http://server:port/directory would see small thumbnails and selecting an image would load it full size on a page with options to browse the previous or next image. I'm looking for a non Apache solution, much like the wonderfull Python simple http server, that can be launched anywhere with minimal configuration & fuss e.g. python -m SimpleHTTPServer 8000 In fact, the python solution above is pretty much want I want except it doesn't thumbnail the images but just a simple directory listing. Happy to use an app written in any common language so long as it is self contained and can run on linux on a custom port (and to re-iterate, not an Apache module).

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• i18n Spring MVC

  - by Enrique

  Hello. I want to use SessionLocaleResolver to get the locale from user session. The documentation says this: "Another option of resolving locales is by SessionLocaleResolver. It resolves locales by inspecting a predefined attribute in a user’s session. If the session attribute doesn’t exist, this locale resolver will determine the default locale from the accept-language HTTP header." But it does not say which attribute do I have to put in session. Y tried saving in session an attribute "lang" with value "en" but it did not work. Anybody knows which attribute do I have to save in session (key,value)?

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• ActiveX controls with old Delphi versions

  - by DamienD

  I'm testing a non visual ActiveX control based on a registered .ocx which I import into Delphi using the provided wizard. Then, I simply put the generated component on the main form of a new VCL application. Under old Delphi versions (D5 and D2007), when i launch the application, this raise an AV during the component initialization. with Delphi 2009 : no problem, the application starts smoothly. My questions are : Are there known enhancements of ActiveX management in recent Delphi versions which can explain this difference ? Can I suspect a bug in the ActiveX control, or can I consider the origin of the problem is from old Delphi versions ? I need to use this component (if tests OK) in D2007. Do you think that it is possible to correct the AV problem under D2007 by modifying the D2007 generated .tlb file (for example by trying to use the D2009 generated one) PS: the ActiveX control is not named, because my question is a general question about Delphi and ActiveX, not about a specific ActiveX control.

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• Multidimensional vectors in scheme?

  - by incrediman

  I earlier asked a question about arrays in scheme (turns out they're called vectors but are basically otherwise the same as you'd expect). Is there an easy way to do multidimensional arrays vectors in PLT Scheme though? For my purposes I'd like to have a procedure called make-multid-vector or something. By the way if this doesn't already exist, I don't need a full code example of how to implement it. If I have to roll this myself I'd appreciate some general direction though. The way I'd probably do it is to just iterate through each element of the currently highest dimension of the vector to add another dimension, but I can see that being a bit ugly using scheme's recursive setup. Also, this seems like something I should have been able to find myself so please know that I did actually google it and nothing came up.

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• Having C# application communicate with Nagios

  - by user200295

  We are using Nagios to monitor our network with great results. There is now a new requirement we are struggling with: We want to notify Nagios of an non fatal but critical application errors. The application does not stop running but there is some sort of issue that needs looking into. Once the issue has been looked into, we need some way to "unflag" the issue in Nagios. We tried using the syslog, but the biggest problem was once an error was logged, the service was put into an error state with no way to recover. Also, while applications would report a critical error to the syslog, most of the time they don't report an "All clear" error.

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• How to write to the OpenGL Depth Buffer

  - by Mikepote

  I'm trying to implement an old-school technique where a rendered background image AND preset depth information is used to occlude other objects in the scene. So for instance if you have a picture of a room with some wires hanging from the ceiling in the foreground, these are given a shallow depth value in the depthmap, and when rendered correctly, allows the character to walk "behind" the wires but in front of other objects in the room. So far I've tried creating a depth texture using: glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, Image.GetWidth(), Image.GetHeight(), 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, pixels); Then just binding it to a quad and rendering that over the screen, but it doesnt write the depth values from the texture. I've also tried: glDrawPixels(Image.GetWidth(), Image.GetHeight(), GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, pixels); But this slows down my framerate to about 0.25 fps... I know that you can do this in a pixelshader by setting the gl_fragDepth to a value from the texture, but I wanted to know if I could achieve this with non-pixelshader enabled hardware?

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• Can mouseenter be made to not fire in IE on DOMready?

  - by mrclay

  jQuery emulates IE's mouseenter event on non-IE browsers. In IE, however, mouseenter is being triggered when the page loads (maybe due to jQuery's use of doScroll in the $.ready implementation), even if the mouse is not moved at all. This doesn't happen in other browsers and definitely doesn't follow Microsoft's own spec, which says (emphasis mine): The event fires only if the mouse pointer is outside the boundaries of the object and the user moves the mouse pointer inside the boundaries of the object. If the mouse pointer is currently inside the boundaries of the object, for the event to fire, the user must move the mouse pointer outside the boundaries of the object and then back inside the boundaries of the object. This only becomes an issue of usability if hover (or the hoverIntent plugin) is applied to a navigational item to display a drop down or "mega-menu": In IE, mouseenter will fire immediately after $.ready, obscuring the content with the menu. I've put together a demonstration of both the mouseenter inconsistency and the usability issue it creates.

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• Detecting first time login of user into application (Google Appengine)

  - by Jake

  My app requires users to login using their google account. I have this set in my App.yamp file: url: /user/.* script: user.py login: required Now when any user tries to access files under /user/secret.py he will need to authenticate via google, which will redirect the user back to /user/secret.py after successful authentication. Now the problem I am facing is when the user is redirected back to the app, I cannot be sure if this is the first time the user has logged in or is it a regular user to my site who has come back again from just the user object which google passes using users.get_current_user() . I thus need to maintain state in the datastore to check if the user already exists or not everytime. If he does not exist i need to create a new entry with other application specific settings. My question is: Is there some easier way to handle this? without having to query the datastore to figure if this is a first time user or a regular one?

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• C# differences between Windows Mobile and regular Windows

  - by Matt

  Are there many differences between Windows and Windows Mobile as far as C# programming is concerned? I can write some moderately complicated programs in C#, but I'm not sure if it would just run perfectly on a Windows smartphone, or if something has to be done to port it. If so, is there a tool that will automatically revise code to make it mobile-compatible? The reason I ask is that the new Windows mobile 7 will only support a few methods of app development, one of which is C#. Also, do smartphones with non-windows operating systems have C# support available? Or can C# code be converted to Symbian or iPhone or whatever? Thanks for any help you can provide.

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